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CIR, 8-17 S, Segment 4, 10.9 S

Name Alias(es): 
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
Location on map: 
National Jurisdiction: 
Maximum or Single Reported Depth (mbsl): 
Tectonic setting: 
Full Spreading Rate (mm/a): 
Volcano Number (if applicable): 
Host Rock: 
Deposit Type: 
Notes on Vent Field Description: 
depth estimated from Fig. 2 in Son et al. (2014); Son et al. (2014): "Many plume sites in segments 1-4 were accompanied by an ORP anomaly, thus indentifying which casts were closest to active hydrothermal sources."; Kim (2010): "rock sampling and CTD casts and tows were performed in northern half of the multibeam survey area in the second leg (IR09 Leg2). Plume signatures were observed at all 5 surveyed segments, suggesting vigorous hydrothermal activities along the northern CIR. However, the optical signals (light transparency and backscattering) of the nearly every cast along the axial valley of the CIR showed increased background level, which might be due to higher level of suspended particles within the axial valley not only by widespread hydrothermal plumes but also by other processes like resuspension. Onboard dissolved methane analysis indicates that the greater part of the plume signals are originated from hydrothermal venting, not by resuspension."
Notes Relevant to Biology: 
Year and How Discovered (if active, visual confirmation is listed first): 
2010 plume only
Discovery References (text): 
Kim, J. (2010) Hydrothermal Exploration along the Northern Central Indian Ridge, 8°-12° S: Preliminary Results of Bathymetry, Volcanic Rock, and Hydrothermal Plume. 39th Underwater Mining Institute.
Son, J., Pak, S.-J., Kim, J., Baker, E.T., You, O.-R., Son, S.-K., Moon, J.-W., 2014. Tectonic and magmatic control of hydrothermal activity along the slow-spreading Central Indian Ridge, 8°S-17°S. Geochemistry, Geophysics, Geosystems 15 (5), 2011-2020, doi: 10.1002/2013GC005206.
Other References (text): 
Son, J.-W. (2011) The Current Activities of KORDI's Environmental Study for Deep-Sea Mining. Accessed 5 May 2015 online at: